Blood pump and heart assist system

Abstract

The application relates to a blood pump and a heart assisting system. The blood pump comprises a pump body and a cover body. The pump body is provided with an inlet pipe. The inlet pipe has a liquid inlet. The periphery of the liquid inlet is provided with a receiving groove. The end of the inlet pipe provided with the liquid inlet further comprises a top surface and an outer circumferential surface. The top surface is located on one side of the receiving groove adjacent to the liquid inlet. The outer circumferential surface is located on the other side of the receiving groove away from the liquid inlet. The cover body covers the liquid inlet and protrudes outward relative to the liquid inlet. The cover body is provided with a plurality of communication holes communicated with the liquid inlet. The mounting part of the cover body is mounted on the receiving groove. The surface of the mounting part exposed outside the receiving groove is smoothly connected with the top surface and the outer circumferential surface. In this way, during the process that the blood flows into the inlet pipe through the cover body, the blood cells cannot be attached to the surface of the inlet pipe and the outer surface of the mounting part, so that the blood thrombus caused by the blood retention is avoided.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a blood pump and cardiac assist system. Background Technology

[0002] A blood pump is a device that connects the ventricle (or atrium) to the artery to assist patients with heart failure by providing a certain blood flow and blood pressure. The inlet tube of the blood pump extends into the ventricle (or atrium), and the outlet tube connects to the artery through an artificial blood vessel. During operation, the blood pump delivers blood from the heart to the artery through the artificial blood vessel. However, traditional blood pumps are prone to blood stagnation during the blood entry process, which can lead to blood clots. Summary of the Invention

[0003] Therefore, it is necessary to provide a blood pump and cardiac assist system that can reduce blood clots.

[0004] In a first aspect, this application provides a blood pump, comprising:

[0005] The pump body is provided with an inlet pipe having a liquid inlet. The inlet pipe also has a receiving groove, a top surface, and an outer circumferential surface, with the top surface and outer circumferential surface located on opposite sides of the receiving groove.

[0006] A cover is provided over the liquid inlet and protrudes outward relative to the liquid inlet. The cover has a plurality of communicating holes communicating with the liquid inlet. The cover has a mounting member, which is at least partially received in the receiving groove. The surface of the mounting member exposed outside the receiving groove smoothly transitions with the top surface and the outer circumferential surface.

[0007] In one embodiment, the surface of the mounting member exposed outside the receiving groove forms an arc surface with the top surface and the outer circumferential surface.

[0008] In one embodiment, the receiving groove is continuously arranged around the outer circumference of the inlet pipe, and the mounting member is annular.

[0009] In one embodiment, the cover further includes a plurality of support rods, each support rod including a first end and a second end away from the first end, the first ends of the plurality of support rods being connected to form an abutment portion, and the second ends of the plurality of support rods being connected to the mounting member; the communicating hole is formed between each pair of adjacent support rods at intervals.

[0010] In one embodiment, the support rod is arc-shaped, and the central angle of the arc corresponding to the support rod is 80° to 100°; and / or, the area of ​​the cross-section of the support rod gradually increases in the direction from the first end to the second end.

[0011] In one embodiment, at least two of the plurality of support rods are arranged opposite each other, and the first ends of the two support rods are connected to form an arched structure.

[0012] In one embodiment, the cover further includes a backing portion and a support portion connected between the backing portion and the mounting member, the connecting hole is provided in the support portion, and the backing portion has a first outer surface facing away from the liquid inlet, the first outer surface being a plane or a convex arc surface.

[0013] In one embodiment, the abutment portion has a first inner surface opposite to the liquid inlet, and the support portion has opposing second inner and second outer surfaces, wherein:

[0014] The first inner surface and the second inner surface transition smoothly; and / or, the first outer surface and the second outer surface transition smoothly.

[0015] In one embodiment, the second outer surface is bent inward on the side near the mounting member to allow a smooth transition between the second outer surface and the outer circumferential surface of the inlet pipe.

[0016] In one embodiment, the area of ​​the first outer surface is S1, the flow area of ​​the inlet pipe at the liquid inlet is S2, and the ratio of S1 to S2 is 0.01 to 0.03.

[0017] In one embodiment, the abutment and the support are integrally formed.

[0018] In one embodiment, the receiving groove has a first receiving side, a second receiving side, and a first bottom surface, the first bottom surface being disposed between the first receiving side and the second receiving side; the mounting member has a first mounting side, a second mounting side, and a second bottom surface, the second bottom surface being disposed between the first mounting side and the second mounting side, the first mounting side being adapted to contact the first receiving side, the second mounting side being adapted to contact the second receiving side, and the second bottom surface being adapted to contact the first bottom surface.

[0019] In one embodiment, the angle formed between the first receiving side and the first bottom surface is an obtuse angle; and / or, the length of the first receiving side in the axial direction of the inlet pipe is greater than the length of the second receiving side in the axial direction of the inlet pipe.

[0020] In one embodiment, the top surface is perpendicular to the second receiving side surface; and / or, the outer circumferential surface is perpendicular to the first receiving side surface.

[0021] In one embodiment, the blood pump is adapted to be installed on the outer wall of the heart, and the inlet tube is able to pass through the outer wall of the heart and extend into the heart, such that the inlet of the inlet tube and the cover are inside the heart.

[0022] Secondly, this application also provides a cardiac assist system, which includes two blood pumps, one of which has an inlet that is connected to the left ventricle and the other of which has an inlet that is connected to the right atrium.

[0023] The aforementioned blood pump and cardiac assist system, by incorporating a shroud protruding outwards from the inlet of the inlet tube, ensures that the shroud rests against the inner wall of the heart during contraction, preventing blockage of the inlet tube. Multiple connecting holes within the shroud allow blood to flow into the inlet tube, ensuring normal blood flow. The shroud's mounting component is installed in the receiving groove of the inlet tube, with a smooth transition between its exposed surface and the top and outer circumferential surfaces of the inlet tube. This prevents steps at the junctions of the outer circumferential surface and the mounting component, and between the mounting component and the top surface, thus eliminating areas of blood cell retention and stagnation. As blood flows through the shroud into the inlet tube, blood cells entering along the surfaces of the inlet tube and the mounting component cannot adhere to these surfaces, preventing blood stagnation and thus avoiding thrombosis. Attached Figure Description

[0024] Figure 1 A perspective view of a blood pump provided in an embodiment of this application.

[0025] Figure 2 for Figure 1 The side view of the blood pump shown.

[0026] Figure 3 for Figure 1 The image shows a longitudinal cross-sectional view of the blood pump.

[0027] Figure 4 for Figure 3 A magnified view of a section at point B.

[0028] Figure 5 for Figure 2 The diagram shows a cross-sectional view of the blood pump in direction II.

[0029] Figure 6 for Figure 1 The diagram shows a partial exploded view of the blood pump.

[0030] Figure 7 for Figure 1 The diagram shows the structure of the blood pump housing from one perspective.

[0031] Figure 8 for Figure 7 The diagram shows the structure of the enclosure from another perspective.

[0032] Figure 9 for Figure 1 The diagram shows a top view of the blood pump housing installed behind the inlet pipe.

[0033] Figure 10 for Figure 5 A magnified view of a section at point C.

[0034] Figure 11 for Figure 10 A diagram showing the result after removing the cover.

[0035] Figure 12 for Figure 10 A schematic diagram after removing the inlet pipe.

[0036] Figure 13 This is a schematic diagram of the structure of the cover of a blood pump provided in another embodiment of this application.

[0037] The labels in the attached diagram are explained as follows:

[0038] 10. Blood pump; 100. Pump body; 111. Pump casing; 1112. Outlet pipe; 113. Drive motor; 115. Impeller; 116. Connecting pipe; 120. Inlet pipe; 120a. Liquid inlet; 121. Receptacle; 1211. First receiving side; 1212. Second receiving side; 1213. First bottom surface; 122. Inner pipe; 123. Outer pipe; 1230. Pipe section; 1231. Connecting part; 1232. Top surface; 123 3. Outer circumferential surface; 200. Cover body; 200a. Connecting hole; 210. Abutting part; 210a. First outer surface; 210b. First inner surface; 220. Support part; 220a. Second outer surface; 220b. Second inner surface; 221. Support rod; 2211. First end; 2212. Second end; 230. Mounting part; 231. First mounting side; 232. Second mounting side; 233. Second bottom surface; L. Central axis. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0041] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., shall be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0045] Heart failure can be classified into left ventricular failure, right ventricular failure, and biventricular failure depending on the location of its occurrence, with left ventricular failure being the most common clinically. For left ventricular failure, the blood pump's inlet is located in the left ventricle, and the outlet is connected to the aorta via an artificial blood vessel. For right ventricular failure, the blood pump's inlet is located in the right atrium, and the outlet is connected to the pulmonary artery via an artificial blood vessel. The inventors of this application discovered that when the heart contracts, the inner wall of the heart can be drawn to the blood pump's inlet tube, affecting normal blood flow and even causing blockage. Especially since the space in the atrium is smaller than that in the ventricle, the blood pump's inlet is easily blocked by the atrial wall, making it difficult for blood to enter the pump and endangering the patient's life. Furthermore, traditional blood pumps have protrusions or grooves at the blood inlet, which can easily cause blood stagnation during the process of blood entering the pump, leading to thrombosis.

[0046] To address at least some of the aforementioned problems, this application provides a blood pump and a cardiac assist system. By positioning a cover at the inlet of the inlet tube and protruding outward relative to the inlet, the cover abuts against the inner wall of the heart when the heart contracts, preventing the inner wall of the heart from blocking the inlet tube of the blood pump. The blood pump and cardiac assist system provided in this application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] Please see Figures 1 to 6One embodiment of this application provides a blood pump 10, which includes a pump body 100 and a cover 200. The pump body 100 is provided with an inlet pipe 120, which has a liquid inlet 120a. The liquid inlet 120a is provided with a receiving groove 121, a top surface 1232, and an outer circumferential surface 1233. The top surface 1232 and the outer circumferential surface 1233 are respectively located on both sides of the receiving groove 121. The cover 200 covers the liquid inlet 120a and protrudes outward relative to the liquid inlet 120a. The cover 200 is provided with a plurality of communicating holes 200a communicating with the liquid inlet 120a. The cover 200 is provided with a mounting member 230, which is at least partially received in the receiving groove 121. The surface 230a of the mounting member 230 exposed outside the receiving groove 121 is smoothly transitioned to the top surface 1232 and the outer circumferential surface 1233. Smooth transition means that there is no obvious abrupt change or step between the surface 230a of the mounting component 230 exposed outside the receiving groove 121 and the top surface 1232 and the outer circumferential surface 1233.

[0048] As an example, the pump body 100 may include a pump housing 111, a drive motor 113, and an impeller 115. The pump housing 111 has an outlet pipe 1112, the impeller 115 is disposed inside the pump housing 111, and the drive motor 113 is connected to the side of the pump housing 111 away from the inlet pipe 120. The drive motor 113 can drive the impeller 115 to rotate, so that blood enters the pump housing 111 from the inlet pipe 120 and flows out from the outlet pipe 1112. In this way, the blood pump 10 can realize the blood pumping function, and has higher blood pumping efficiency and simpler structure compared with traditional blood pumps.

[0049] During the use of the blood pump 10, the drive motor 113 drives the impeller 115 to rotate, allowing blood from the ventricles or atria to enter the pump body 100 through the inlet pipe 120. After centrifugal action by the impeller 115, the blood flows out through the outlet pipe 1112 and then through the artificial blood vessel to the aorta or pulmonary artery. The blood pump 10 is an implantable blood pump, suitable for installation on the outer wall of the heart. The inlet pipe 120 can penetrate the outer wall of the heart and extend into the heart, so that the inlet port 120a and the cover 200 of the inlet pipe 120 are inside the heart. Implantable blood pumps have a large pumping flow rate and a longer service life. For ease of description, the following description uses the blood pump 10 used in the right heart as an example, that is, the inlet pipe 120 of the blood pump 10 penetrates the atrial wall and extends into the atrium.

[0050] During the use of the blood pump 10, when the heart contracts, the cover 200 of the blood pump 10 will abut against the inner wall of the atrium to support the inner wall of the atrium. The blood in the atrium flows into the inlet tube 120 through the connecting hole 200a of the cover 200, and then flows out from the outlet tube 1112 after being centrifuged by the impeller 115, and finally flows to the pulmonary artery through the artificial blood vessel.

[0051] As can be seen, the blood pump 10 of this application has a cover 200 protruding outward relative to the inlet 120a of the inlet tube. When the heart contracts, the cover 200 will abut against the inner wall of the heart, preventing the inner wall of the heart from blocking the inlet tube 120 of the blood pump 10. Since the cover 200 is provided with multiple connecting holes 200a that communicate with the inlet 120a, blood in the heart can flow into the inlet tube 120 through the multiple connecting holes 200a, ensuring normal blood flow. The mounting component 230 of the cover 200 is installed in the receiving groove 121 of the inlet pipe 120, and the surface 230a of the mounting component 230 exposed outside the receiving groove 121 smoothly transitions with the top surface 1232 and the outer circumferential surface 1233 of the inlet pipe 120, so that no steps are formed at the junction of the outer circumferential surface 1233 and the mounting component 230, and at the junction of the mounting component 230 and the top surface 1232, and there is no blood cell retention area or turbulence area. During the process of blood flowing into the inlet pipe 120 through the cover 200, the blood cells of the blood entering along the surface of the inlet pipe 120 and the outer surface 230a of the mounting component 230 cannot adhere to the surface of the inlet pipe 120 and the outer surface 230a of the mounting component 230. Therefore, blood stagnation will not occur, thereby avoiding thrombosis caused by blood stagnation.

[0052] In this embodiment, the receiving groove 121 is continuously arranged around the outer circumference of the inlet pipe 120, and the mounting member 230 is annular. The mounting member 230 is at least partially received in the receiving groove 121, which increases the contact area between the mounting member 230 and the inlet pipe 120, thereby increasing the connection strength between the cover 200 and the inlet pipe 120. In other embodiments, there may be multiple receiving grooves 121, which are arranged circumferentially along the inlet pipe 120, and the mounting member 230 is rod-shaped, which can also achieve the goal of at least partially receiving the mounting member 230 in the receiving groove 121.

[0053] Please see Figure 1 and Figure 5 The inlet pipe 120 is a cylindrical structure with a hollow pipe wall. The inlet pipe 120 includes an inner pipe 122 and an outer pipe 123. The outer pipe 123 surrounds the inner pipe 122. The inner pipe 122 is the conduit through which blood flows. The side of the inner pipe 122 away from the liquid inlet 120a and the side of the outer pipe 123 away from the liquid inlet 120a are both connected to the pump housing 111. The side of the inner pipe 122 away from the liquid inlet 120a and the side of the outer pipe 123 away from the liquid inlet 120a are spaced apart to reserve space for placing a magnetic ring between the inner pipe 122 and the outer pipe 123.

[0054] The outer tube 123 includes a tube portion 1230 and a connecting portion 1231. The tube portion 1230 is generally a hollow cylindrical structure, and the connecting portion 1231 is located at the end of the inlet tube 120 that has a liquid inlet 120a. The connecting portion 1231 extends obliquely from the tube portion 1230 toward the inner tube 122 to connect with the inner tube 122, and a receiving groove 121 is provided in the connecting portion 1231. Since the inner tube 122 is the conduit through which blood flows, placing the receiving groove 121 in the connecting portion 1231 of the outer tube 123, rather than placing it in the inner tube 122, will not affect the structure of the inner tube 122, and therefore will not affect the flow of blood from the liquid inlet 120a to the inlet tube 120. If the receiving groove 121 is provided in the tube portion 1230, the cover 200 will protrude radially along the inlet tube 120. Therefore, compared to providing the receiving groove 121 in the tube portion 1230, providing the receiving groove 121 in the connecting portion 1231 of the outer tube 123 can make the maximum outer diameter of the cover 200 smaller than the outer diameter of the inlet tube 120, thereby reducing the opening size on the heart.

[0055] Please see Figure 4 and Figure 7 The outer tube 123 has a top surface 1232 and an outer circumferential surface 1233, both of which are exposed and are annular surfaces. The top surface 1232 is located on the side of the receiving groove 121 adjacent to the inlet 120a, and the outer circumferential surface 1233 is located on the side of the receiving groove 121 away from the inlet 120a. In this embodiment, the surface 230a of the mounting member 230 exposed outside the receiving groove 121 is set as an arc-shaped surface, and the outer circumferential surface 1233 is also set as an arc-shaped surface. The surface 230a of the mounting member 230, together with the top surface 1232 and the outer circumferential surface 1233, forms an arc surface, which can improve the appearance consistency of the blood pump 10 while avoiding blood stagnation. It can be understood that in some embodiments, the surface 230a of the mounting member 230, together with the top surface 1232 and the outer circumferential surface 1233, can form a single plane.

[0056] In some embodiments of this application, the cover 200 can be a metal material with good biocompatibility, such as stainless steel (e.g., 316L steel) or platinum-iridium alloy, or a polymer material with good biocompatibility and certain support strength, such as PE (polyethylene) or PET (thermoplastic polyester).

[0057] In some embodiments of this application, the cover 200 can be connected to the inlet pipe 120 by means of bonding, welding or other methods. For example, glue is placed in the receiving groove 121, and the mounting part 230 is initially connected to the inlet pipe 120 through the glue in the receiving groove 121. Then, the mounting part 230 can be fixedly connected to the inlet pipe 120 by welding, so that the cover 200 can be assembled to the inlet pipe 120.

[0058] See also Figures 1 to 8 In some embodiments of this application, the cover 200 further includes a plurality of support rods 221, which form a support portion 220. The plurality of support rods 221 are spaced apart circumferentially along the mounting member 230. Each support rod 221 includes a first end 2211 and a second end 2212 away from the first end 2211. The first ends 2211 of the plurality of support rods 221 are connected to each other to form an abutment portion 210, and the second ends 2212 of the plurality of support rods 221 are all connected to the mounting member 230. A connecting hole 200a is formed between every two adjacent support rods 221. This structure of the support rods 221 ensures that the cover 200 has sufficient support strength without affecting blood flow, thereby effectively supporting the atrial wall during cardiac contraction.

[0059] In this embodiment, multiple connecting holes 200a are spaced apart around the axis of the inlet pipe 120, which avoids the situation where all connecting holes 200a are blocked by the inner wall of the heart, allowing blood in the heart to flow into the inlet pipe 120 through at least one connecting hole 200a, thereby ensuring normal blood flow.

[0060] The number of support rods 221 can be three to six, ensuring that the hood 200 can effectively support the atrial wall while ensuring smooth blood flow through the fluid inlet tube 120. If the number of support rods 221 is less than three, the hood 200 will not be able to support the atrial wall during cardiac contraction and will deflect; if the number of support rods 221 is greater than six, it will reduce the blood flow through the hood 200 to the inlet tube 120.

[0061] In this embodiment, the second ends 2212 of the plurality of support rods 221 are evenly arranged along the circumference of the inlet pipe 120, such that the spacing between any two adjacent support rods 221 is equal. Since a connecting hole 200a is formed between two adjacent support rods 221, and the size of the plurality of connecting holes 200a is equal, blood can flow evenly into the inlet pipe 120 through the plurality of connecting holes 200a of the cover 200, thus ensuring the stable pumping of blood by the blood pump 10.

[0062] See also Figure 7 and Figure 8The support rod 221 is arc-shaped, and the central angle corresponding to the arc of the support rod 221 is 80° to 100° (e.g., 80°, 85°, 90°, 95°, 100°, etc.). This design not only ensures that the connecting hole 200a is large enough, but also prevents the connecting hole 200a from being blocked, and avoids the formation of a sharp angle after the first end 2211 of the support rod 221 connects with the abutment part 210, thus reducing damage to the atrial wall. The support rod 221 can be integrally formed with the abutment part 210, ensuring the connection strength between the support part 220 and the abutment part 210, and also ensuring a smooth connection between the support part 220 and the abutment part 210, reducing damage to the atrial wall and also reducing disruption to the blood.

[0063] In one embodiment, the cross-sectional area of ​​the support rod 221 gradually increases in the direction from the first end 2211 to the second end 2212 of the support rod 221. This can reduce the obstruction effect of the support rod 221 on blood flow and ensure that the cover 200 is assembled to the inlet pipe 120 with sufficient connection strength.

[0064] The edges of the support rod 221 are chamfered or rounded. This reduces the impact of the edges of the support rod 221 on the blood and prevents hemolysis.

[0065] In this embodiment, at least two of the multiple support rods 221 are arranged opposite each other, and the first ends 2211 of the two support rods 221 are connected to form an arched structure 222. The connection of the opposite support rods 221 to form the arched structure 222 not only makes it more compatible with the shape of the curved atrial wall, further reducing the damage of the cover 200 to the atrial wall, but also allows the other support rod 221 to share the pressure when one of the two support rods 221 is under pressure, increasing the limit of external force that the arched structure 222 can withstand, greatly increasing the support strength of the cover 200, and reducing the probability of deformation of the cover 200 due to long-term contact with the atrial wall.

[0066] In this embodiment, there are four support rods 221 and two arched structures 222, which are arranged in a cross shape, so that the support rods 221 can apply a uniform force to the inner wall of the atrium. In other embodiments, the number of arched structures 222 can be three or more, depending on the actual situation.

[0067] See Figure 5The abutment part 210 has a central axis, which coincides with the central axis L of the inlet pipe 120. This arrangement of the abutment part 210 and the inlet pipe 120 ensures that the abutment part 210 can fully contact the inner wall of the atrium during cardiac contraction, without affecting the flow of blood from the atrium into the inlet pipe 120 through the connecting hole 200a.

[0068] See Figure 7 The edges of the contact portion 210 are chamfered or rounded. This design reduces the impact of the edges of the contact portion 210 on the blood and prevents hemolysis.

[0069] like Figure 7 and Figure 8 As shown, the abutment portion 210 has a first outer surface 210a and a first inner surface 210b facing each other. The first outer surface 210a faces away from the liquid inlet 120a, and the first inner surface 210b faces the liquid inlet 120a. The first outer surface 210a can be a flat surface or a convex arc surface, so that when the cover 200 moves towards the inner wall of the atrium, the first outer surface 210a can fit against the inner wall of the atrium over a larger area, reducing damage to the inner wall of the atrium. In this embodiment, the shape of the first outer surface 210a of the abutment portion 210 can match the contour of the inner wall of the atrium, which can further reduce damage to the inner wall of the atrium.

[0070] The support portion 220 has a second inner surface 220b and a second outer surface 220a facing each other, wherein the second inner surface 220b faces the liquid inlet 120a, and the second outer surface 220a faces away from the liquid inlet 120a. In this embodiment, the first outer surface 210a and the second outer surface 220a transition smoothly, and the first inner surface 210b and the second inner surface 220b transition smoothly, which can guide blood flow and further reduce the damaging effect of the cover 200 on the blood, thereby effectively avoiding hemolysis. In one embodiment, the first outer surface 210a and the second outer surface 220a transition smoothly, while the first inner surface 210b and the second inner surface 220b transition non-smoothly; for example, there is an abrupt change at the junction of the first inner surface 210b and the second inner surface 220b. In another embodiment, the first outer surface 210a and the second outer surface 220a transition non-smoothly, while the first inner surface 210b and the second inner surface 220b transition smoothly.

[0071] In this embodiment, both the first inner surface 210b and the first outer surface 210a are curved surfaces, and the curvatures of the first inner surface 210b and the first outer surface 210a are the same. This makes the abutment portion 210 plate-shaped, reducing the protrusion height of the cover 200. Compared to setting the abutment portion 210 in a conical or circular shape, setting the abutment portion 210 in a plate shape increases the contact area between the cover 200 and the inner wall of the atrium, thereby reducing the damage of the cover 200 to the inner wall of the atrium, which is especially suitable for the narrower space of the inner wall of the atrium. In other embodiments, the first inner surface 210b and the first outer surface 210a can also be planar, and the first inner surface 210b and the first outer surface 210a are parallel, which can also reduce the protrusion height of the cover 200.

[0072] See Figure 9 The area of ​​the first outer surface 210a is S1, and the flow area of ​​the inlet pipe 120 at the liquid inlet 120a is S2. The ratio of S1 to S2 is 0.01~0.03, where S2 = D is the inner diameter of the liquid inlet 120a. A ratio ≤0.03 can reduce damage to the atrial wall while ensuring normal blood flow. If the ratio of the area S1 of the first outer surface 210a to the flow area S2 of the inlet tube 120 is less than 0.01, the abutment portion 210 is too small, which will damage the atrial wall; if the ratio of the area S1 of the first outer surface 210a to the flow area S2 of the inlet tube 120 is greater than 0.03, the abutment portion 210 is too large, which will reduce the flow rate of blood entering through the connecting hole 200a, thereby affecting normal blood flow. It should be noted that, for ease of identification, this application uses... Figure 9 The area enclosed by the dotted circle is the abutment portion 210, and the shape of the abutment portion 210 can be... Figure 9 The circle shown can also be other shapes, such as regular polygons or irregular shapes, like squares or pentagons.

[0073] See Figure 11 The receiving groove 121 has a first receiving side surface 1211, a second receiving side surface 1212, and a first bottom surface 1213 disposed between the first receiving side surface 1211 and the second receiving side surface 1212. The first receiving side surface 1211 is the outer annular surface of the receiving groove 121, and the second receiving side surface 1212 is the inner annular surface of the receiving groove 121. In this embodiment, the included angle formed between the first receiving side surface 1211 and the first bottom surface 1213 is an obtuse angle to increase the width of the opening of the receiving groove 121, facilitating the insertion of the mounting component 230 into the receiving groove 121, thereby facilitating the assembly of the cover 200.

[0074] In one embodiment, the length of the first receiving side 1211 in the axial direction of the inlet pipe 120 is greater than the length of the second receiving side 1212 in the axial direction of the inlet pipe 120. This allows the first bottom surface 1213 to be set as a plane perpendicular to the axis of the inlet pipe 120, which facilitates the placement of the adhesive in the receiving groove 121, thereby facilitating the assembly of the cover 200 to the inlet pipe 120.

[0075] See Figure 11 In this embodiment, the first receiving side 1211 is perpendicular to the outer circumferential surface 1233, and the second receiving side 1212 is perpendicular to the top surface 1232. That is, the included angle α1 formed between the first receiving side 1211 and the outer circumferential surface 1233 is 90°, and the included angle α2 formed between the second receiving side 1212 and the top surface 1232 is 90°. This avoids the formation of acute angles between the first receiving side 1211 and the outer circumferential surface 1233, and between the second receiving side 1212 and the top surface 1232. This prevents thermal stress concentration between the first receiving side 1211 and the outer circumferential surface 1233, and between the second receiving side 1212 and the top surface 1232, when the mounting part 230 is welded to the inlet pipe 120, thereby preventing damage to the liquid inlet 120a of the inlet pipe 120. In one embodiment, the first receiving side 1211 is perpendicular to the outer circumferential surface 1233, and the second receiving side 1212 is not perpendicular to the top surface 1232. In another embodiment, the first receiving side 1211 is not perpendicular to the outer circumferential surface 1233, and the second receiving side 1212 is perpendicular to the top surface 1232.

[0076] See Figure 12Correspondingly, the mounting component 230 has a first mounting side 231, a second mounting side 232, and a second bottom surface 233 disposed between the first mounting side 231 and the second mounting side 232. The first mounting side 231 is adapted to contact the first receiving side 1211, the second mounting side 232 is adapted to contact the second receiving side 1212, and the second bottom surface 233 is adapted to contact the first bottom surface 1213. Here, "adapted contact" refers to two surfaces being in contact and having matching dimensions, that is, the length and width of the two surfaces are equal. The first mounting side 231 is adapted to contact the first receiving side 1211, the second mounting side 232 is adapted to contact the second receiving side 1212, and the second bottom surface 233 is adapted to contact the first bottom surface 1213. This ensures that the contact area between the mounting component 230 and the inlet pipe 120 is large enough, thus ensuring the connection strength between the two. It also ensures that after the mounting component 230 is assembled into the receiving groove 121, the first mounting side 231 of the mounting component 230 does not protrude from or is recessed from the first receiving side 1211 of the receiving groove 121, and the second mounting side 232 of the mounting component 230 does not protrude from or is recessed from the second receiving side 1212 of the receiving groove 121. This ensures a smooth transition at the connection between the mounting component 230 and the inlet pipe 120, avoiding blood stasis and thrombosis.

[0077] See Figure 10 and Figure 12 The second outer surface 220a of the support 220 is bent inward on the side near the mounting member 230 so that the second outer surface 220a can smoothly transition with the outer circumferential surface 1233 of the inlet pipe 120, thereby ensuring a smooth transition at the connection between the support rod 221 and the inlet pipe 120 and preventing thrombosis.

[0078] Of course, in other embodiments of this application, see... Figure 13 The cover 200 can be a mesh structure, and the mesh holes on the mesh structure form connecting holes 200a. This design allows the connecting holes 200a to cover the entire cover 200, ensuring that blood in the atrium can flow smoothly through the cover 200 into the inlet tube 120, regardless of the contact area between the cover 200 and the inner wall of the atrium.

[0079] Specifically, the cover 200 can be as follows: Figure 13 The cover is hemispherical. The cover 200 includes a support portion 220, and it should be noted that the top of the support portion 220 forms abutment portion 210. Setting the cover 200 in a hemispherical shape not only makes the surface of the abutment portion 210 a curved surface, reducing damage to the atrial wall, but also makes the surface of the support portion 220 smoother, reducing damage to the blood.

[0080] Regarding the mesh density and aperture size, as long as they can effectively support the inner wall of the atrium and allow blood in the atrium to flow smoothly through the cover 200 into the inlet tube 120, this application does not impose specific restrictions.

[0081] The mesh can be circular or a regular polygon (e.g., quadrilateral, pentagon, or...). Figure 12 (e.g., hexagons, etc.) or irregular polygons, as shown. Considering that the walls of circular mesh are smoother and have no sharp edges, making it less prone to thrombosis, it can be given priority.

[0082] To facilitate the assembly of the cover 200 of the mesh structure to the inlet 120a of the inlet pipe 120, an assembly (not shown in the attached figure) may be provided at one end of the cover 200 near the inlet 120a of the inlet pipe 120. The structure of the assembly and the way it is fitted with the inlet pipe 120 may be the same as the mounting part 230 of the cover 200.

[0083] In another embodiment, the abutment portion 210 can also be an independent structure, that is, the abutment portion 210 is not formed by connecting multiple support rods 221.

[0084] Specifically, in addition to the mounting member 230, the cover 200 also includes abutment portion 210 and support portion 220 connected between abutment portion 210 and mounting member 230. Support portion 220 includes multiple support rods 221, the first ends 2211 of which are all connected to abutment portion 210. An arched structure 222 is formed by two support rods 221 and abutment portion 210. Multiple connecting holes 200a are provided in support portion 220. Abutment portion 210 is connected to the side of support portion 220 away from mounting member 230 and is positioned opposite to the inlet port 120a of inlet pipe 120. When the heart contracts, support portion 220 of cover 200 supports the inner wall of the atrium, and abutment portion 210 of cover 200 abuts against the inner wall of the atrium.

[0085] In this embodiment, the abutment part 210 and the support part 220 are integrally formed parts, that is, the abutment part 210 and the support part 220 are made by an integral forming process, which avoids connecting the abutment part 210 and the support part 220 through welding or other processes, simplifies the manufacturing process of the cover 200, and improves the connection strength between the abutment part 210 and the support part 220.

[0086] One embodiment of this application also provides a ventricular assist system, which includes two blood pumps 10. The inlet 120a of one blood pump 10 can be connected to the left ventricle, and the inlet 120a of the other blood pump 10 can be connected to the right atrium. This makes the heart assist system of this application a dual-pump system. The dual-pump system can be applied to scenarios where the left and right hearts fail simultaneously, thus expanding the applicability of the heart assist system.

[0087] Furthermore, both blood pumps 10 can be connected to an external power source and controller via connectors. The controller and power source can be selectively connected to one of the blood pumps 10 or simultaneously to both blood pumps 10, enabling the cardiac assist system to be used not only for left ventricular failure but also for right ventricular failure and simultaneous left and right ventricular failure, thus further expanding the applicability of the cardiac assist system.

[0088] In summary, the cardiac assist system provided in this application includes a blood pump 10, thus preventing the inlet tube 120 of the blood pump 10 from being blocked by the inner wall of the heart. The cardiac assist system of this application is a dual-pump system, which can be applied to scenarios where both the left and right hearts fail simultaneously, thus expanding the applicability of cardiac assist systems.

[0089] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A blood pump, characterized in that, include: The pump body is provided with an inlet pipe having a liquid inlet. The inlet pipe has a receiving groove, a top surface, and an outer circumferential surface, with the top surface and the outer circumferential surface located on opposite sides of the receiving groove, and both exposed. A cover is provided over the liquid inlet and protrudes outward relative to the liquid inlet. The cover has a plurality of communicating holes communicating with the liquid inlet. The cover has a mounting member, which is at least partially received in the receiving groove and fixedly connected to the inlet pipe. The surface of the mounting member exposed outside the receiving groove smoothly transitions with the top surface and the outer circumferential surface.

2. The blood pump according to claim 1, characterized in that, The surface of the mounting component exposed outside the receiving groove forms an arc surface with the top surface and the outer circumferential surface.

3. The blood pump according to claim 1, characterized in that, The receiving groove is continuously arranged around the outer circumference of the inlet pipe, and the mounting component is annular.

4. The blood pump according to claim 1, characterized in that, The cover also includes a plurality of support rods, each of the support rods including a first end and a second end away from the first end, the first ends of the plurality of support rods being connected to form abutment, and the second ends of the plurality of support rods being connected to the mounting member; a connecting hole is formed between each pair of adjacent support rods.

5. The blood pump according to claim 4, characterized in that, The support rod is arc-shaped, and the central angle corresponding to the arc of the support rod is 80° to 100°. And / or, the cross-sectional area of ​​the support rod gradually increases in the direction from the first end to the second end.

6. The blood pump according to claim 4, characterized in that, At least two of the plurality of support rods are arranged opposite each other, and the first ends of the two support rods are connected to form an arched structure.

7. The blood pump according to claim 1, characterized in that, The cover also includes a backing portion and a support portion connected between the backing portion and the mounting member. The connecting hole is provided in the support portion. The backing portion has a first outer surface facing away from the liquid inlet. The first outer surface is a plane or a convex arc surface.

8. The blood pump according to claim 7, characterized in that, The abutment portion has a first inner surface opposite to the liquid inlet, and the support portion has opposing second inner and second outer surfaces, wherein: The first inner surface and the second inner surface transition smoothly; and / or, the first outer surface and the second outer surface transition smoothly.

9. The blood pump according to claim 8, characterized in that, The second outer surface bends inward on the side closest to the mounting member to allow a smooth transition between the second outer surface and the outer circumferential surface of the inlet pipe.

10. The blood pump according to claim 7, characterized in that, The area of ​​the first outer surface is S1, the flow area of ​​the inlet pipe at the liquid inlet is S2, and the ratio of S1 to S2 is 0.01~0.

03.

11. The blood pump according to claim 7, characterized in that, The abutment and the support are integrally formed.

12. The blood pump according to claim 1, characterized in that, The receiving groove has a first receiving side, a second receiving side, and a first bottom surface, with the first bottom surface disposed between the first receiving side and the second receiving side; the mounting member has a first mounting side, a second mounting side, and a second bottom surface, with the second bottom surface disposed between the first mounting side and the second mounting side, the first mounting side adapting to and contacting the first receiving side, the second mounting side adapting to and contacting the second receiving side, and the second bottom surface adapting to and contacting the first bottom surface.

13. The blood pump according to claim 12, characterized in that, The angle formed between the first receiving side and the first bottom surface is an obtuse angle; and / or, the length of the first receiving side in the axial direction of the inlet pipe is greater than the length of the second receiving side in the axial direction of the inlet pipe.

14. The blood pump according to claim 12, characterized in that, The top surface is perpendicular to the second receiving side surface; and / or, the outer circumferential surface is perpendicular to the first receiving side surface.

15. The blood pump according to any one of claims 1-14, characterized in that, The blood pump is designed to be installed on the outer wall of the heart, and the inlet tube is designed to pass through the outer wall of the heart and extend into the heart, such that the inlet of the inlet tube and the cover are located inside the heart.

16. A cardiac assist system, characterized in that, The cardiac assist system further includes two blood pumps as described in any one of claims 1-15, wherein the inlet of one blood pump is connected to the left ventricle and the inlet of the other blood pump is connected to the right atrium.

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